暗算
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Meanings
mental arithmetic
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Example sentences
She quickly worked through complex calculations using mental arithmetic.
It is said that people who are good at mental arithmetic have very active brains.
There is a risk that relying too much on calculators will cause one's mental arithmetic ability to deteriorate.
Because he has been training his mental arithmetic since childhood, he can calculate any numbers instantly.
The result that was calculated mentally was later confirmed to be accurate through machine verification as well.
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